This is not really true. When building a n/a 4.6L you need to be able to rev the **** outta it to make power.
However, IMO it is useless to put the bottom end kit in if all you are going to do is stage 2 cams and thats it. You might as well save your cash, forget the cams and shortblock, and go with a blower right off the bat.
EDIT: really really loud exhaust is really really cool for about 20 minutes, and it can quickly get really really annoying after that.
Good call. I wasn't thinking N/A.
I have to agree on the loud exhaust. I had a Bosal exhaust on my mazda 6 (v6) and it was quite annoying listening to the resonance inside the car.
The car was totalled and now I have Borla and while they are loud on the outside, they sound quite mellow from inside the car.